Sketching and drawing apparatus.



c. THOMSON. SKETCHINGAND DRAWING APPARATUS.

APPLICATION FILED JULY 22,1915- Patented Mar. 13, 1917. A9 3 SHEETS-SHEET l.

7 ado a C. THOMSON.

SKETCHING AND DRAWING APPARATUS.

APPLICATION FILED lULY 22.1915.

1,21 8,964. Patented Mar. 13, 1917.

3 SHEETS-SHEET 2- 10 umu. wAsmmnon. u c

C. THOMSON.

SKETCHING AND DRAWiNG APPARATUS.

APPLICATION FILED JULY 22,1915.

1,218,964. Patented Mar. 13, 1917.

3 SHEETS-SHEET 3.

UNITED STAlES PATENT OFFICE.

CHRISTIAN'TI-IOMSON, 'OF GOLVILIJE, WASHINGTON.

SKETOHING AND DEA-WING APPARATUS.

Application filed July 22, 1915.

[ all whom it may concern:

Be it known that I, CHRISTIAN THOMSON, a subject of the King of Norway, residing at Colville, in the county of Stevens and State of lVashington, have invented certain new and useful Improvements in Sketching and Drawing Apparatus, of which the following is a specification.

The object of this invention is to provide a device which can be supported on or in overhanging relation with a drawing board so that the operator can view an object to be drawn. and transfer to the paper on the drawing board, an accurate outline of the object as seen or viewed by the user, through the instrument.

Generally speaking, my invention includes a support on which a rocking member is mounted to oscillate about a given axis, a pencil or like holder being mounted on said rocking member to oscillate about an axis preferably at right angles to and intersecting the axis of the oscillation of said member a view finding means also being mounted on said rocking member with the line of vision intersecting the axis of said rocking member and also the axis of said pencil holder.

Broadly speaking, my view finding apparatus includes front and rear sighting membars, the front sighting member being preferably designated as a point or object cator and the rear sighting member being preferably'in the form of a sight tube. In this connection, my improved front sight or object locator includes a novel form of device in which crossed cords or wires are provided, the intersection thereof being as a pointer locating device to be alined with the points of the object to be drawn, and also with the rear sight or vision tube. My improved locator also comprises adjustable features whereby the crossing point or 10- eating point may be altered not only for the purpose of adjustment of the view finder with respect to the pencil holder but also. to determine the position which the drawing will assume on the drawing paper.

A further object of my invention is to operatively connect the pencil holder and a view finding means so that as the pencil holder is swung in one direction, the view finding means will be shifted in a direction corresponding to, and preferably in the same direction as that in which the pencil holder has been shifted. The foregoing re- Specification of Letters Patent.

Patented Mar. 13, 191 *7.

Serial No. 41,311.

lates to shifting movement of the pencil holder and view finding means about their axes but I also consider it novel to mount both the view finding means and thepencil holder upon the rocking member so that the view finding means and pencil holder will be bodily shifted corresponding to the shifting movement imparted to the rocking memher.

A further object of my invention is to provide an improvedform of clamp whereby the support may be rigidly attached to the drawing board or other selected point of anchorage, such clamp having improved means whereby the support maybe adjusted in case it in any way'becomes disalined.

Other features and objects of the invention will be more'fully described in connection with the accompanying drawings and will be more particularly pointed out in and by the appended claims.

In the drawings V Figure 1, is a front view in elevation showing the device of my invention applied to a drawing board, and looking in the direction in which the operator would-face in using theinstrument. Fig.2 is a view in sideelevation looking from the left of Fig. l.

Fig. 3 is a plan view of the drawing instrument.

Fig. 4 is a sectional view-on line 4-. L of Fig. 3.

Fig. 5 is'an end view looking from the left of Fig. 3. a

"Fig. (i is a view in elevationlooking in the direction of arrow 6 of Fig. 2.

Fig. 7 is .a sectional view on line '77 of Fig. 6. i

' Like characters of reference designate similar partstthroughout thedifferent figures ofthe drawings.

As illustrated 1 designates a drawing board on which a sheet of drawing paper 2 may be securedin any desired manner as by means of thumb tacks 3. The drawing board 1 has been shown provided with a marginal cleat or batten 4, with. which boards of this character are sometimes equipped.

A. support is indicatedwhich is of the fork type, the shank of which is shown at 5 and the forked portion being indicatedat 6. If desired and as shown, the support maybe formed of two separate lengths of material which may be suitably spaced by ablock"? 11G tau and held in suitable spaced parallel relation below the crotch of the fork by a metal clip 8. In this construction, the shank 5 comprises the two lengths of material 5' which extend upwardly and also form the forked portions 6.

Means is provided for anchoring the fork support to the drawing board 1, such means being broadly indicated at 9 and functioning to hold the support in overhanging relation with respect to the drawing board 1. Such means is in the form of a novel clamp which will be hereinafter described in detail.

The upper ends of the forked members 6 are provided with journal strips 10 in which a rocking member 11 is mounted, said member 11 having trunnions 12 ournaled in said bearings 10 to permit of said rocking member being oscillated about a horizontal rocking axis.

The rocking member 11 may be a wooden strip or a bar of other suitable material and I have shown the same provided with a mounting plate 18 of sufiicient length to depend some distance below the rocking member 11. The mounting plate 13 is bored at 14:, and the margin 15 thereof, is bent outwardly to form a swivel connection for a pencil holder which will presently be described. The upper end of the pencil holder includes a. metal plate 16 provided with an aperture which is of corresponding size with respect to the bent out ournal margin 15 so as to be swiveled thereon, as will be seen more clearly in Fig. 4. In order to hold the plate 16, of the pencil holder, in position upon the journal 15, I provide a clip 17 fixed to the plate 13 overhanging the holder plate 16. In order to steady the holder plate 16, I also provide a clip 19 which overhangs the opposite face of 13, at 20. Thus the pencil holder will be held to a swinging movement in a plane parallel with the plane of the rocking member 11. Said pencil holder includes a bar 21, fixed to plate 16, and extending therebelow, said bar forming one of two telescoping members whereby the pencil or marker may be longitudinally extended in accordance with requirements. The other of said telescoping members includes a pencil carrying bar 22 having clips 23 and 24 for longitudinal sliding engagement with bar 21. Upon the lower end of bar 22 is a pencil holder 25 in which a pencil 26 is mounted.

Now by looking at Fig. 1, it will be seen that as the pencil holder is swung to the right or left it would have to be lengthened in order to maintain the pencil 26 in engagement with the surface of the paper. Furthermore. by looking at Fig. 2, it will be seen that as the pencil holder is moved to the right or left the same would have to be lengthened or shortened in order to maintain the pencil upon the drawing surface. It is thought that it will now be clear that the pencil holder has a substantially universal movement because of the fact that it can not only be swung on the rocking axis of the rocking member 11 but also about an axis transverse thereto, which latter axis is the center of the journal 15. The plate 16 of the pencil carrier is extended upwardly to form forked portions 27 which are shown projecting above the member 11 and laterally of the longitudiual axis of the pencil holder. The purpose of these forked portions or arms will presently appear.

Reference will next be made to my improved view finding means.

hi) improved view finding means includes a frame comprising a lower bar or strip 26 and an upper bar or strip 29. vSaid strips and 29 may be formed of a single length of material and may be bent upon themselves as at 30. to form hinge butts in. which 111) improved object locator is hingedly mounted. The upper bar or strip 29 extends to the top of said rocking member where it pivolally mounted upon a spindle 31. The spindle extends dmvnwardly through the member 11 and the lower bar or strip 28 is mounted on the lower end of spindle 31, at the lmver edge of the rocking member 11. Spindle 31 intersects the rocking axis of member 11 and therefore it will be seen that the view finding means is mounted to swing about a vertical axis intersecting the horizontal rocking axis of the member 11.

My improved object locator includes a strip of resilient metal 32 which extends through the butts of the strips 28 and 29, one length of said strip extending downwardly as at 33 and being tensioned to normally swing to the left of Fig. 5. The other end 3% ex tends downwardly and is tensioned to normally swing to the right of Fig. 5. The terminal. end extends horizontally beneath the butts 30 and is provided with a crooked end 36. Said terminal end 35 is tensioned to normally swing downwardly from the butts 30. A wire 07 is connected at 38 and 39 and a wire 4:0, in crossed relation with wire 3'7, is connected at 41 and Because of the fact that the frame of the locator is resilient and normally springs outwardly, from the contour shown in Fig. 5, both later ally and downwardiy, it will be seen that the wires 37 and 4-0 will always be stretched taut. The crossing point 43 will be the point which will be alined with that portion of the object to be located, and with the rear sight or vision tube 2 which will presently be described. The wire 4-0 will be adjustable the locator frame, vertically. so that the 1 1g point .3 may be adjusted above or below the position shown in Fig. 5 as desired.

The rear end of strip 28 terminates in a vision tube 4%, and as shown, this tube is provided with an aperture through which the lower end of spindle 81 projects so that the tube itself will be pivoted on spindle 31. The eye end 15, of the tube at, is shown projecting through journal 15 and somewhat laterally of the plane of rocking memberll. The curved line 16 indicates the eye of the user as it will be positioned adjacent the vision tube or rear sight H.

I will next describe the manner in which my-iniproved view finding means is connected with my improved pencil holder.

The lower strip or bar 28 is provided with arms 17 extending laterally thereof and formed, as shown, of a single strip of material. Each of the arms 17 is connected by a cord 4-8, extending beneath the rocking member 11 and thence upwardly where the remaining ends of the cords -18 are connected at L9 with the forked arms 2?. It will now be clear that as the pencil holder is swung to the right or left of Fig. 1, a corresponding shifting movement will be imparted to the view [hiding means about the spindle 31, an axis.

In order to prevent light from interfering with the vision of the user, a dark pad 50, of any suitable dark colored material, and preferably in the form of a disk, may be mounted upon the vision tube 44, as more clearly shown in Fig. 2. This will prevent the rays of light entering through the opening 15,

from obscuring the vision of the user looking.

through the tube 14.

In using the device of my invention, the drawing board will be disposed at a selected distance from the object to be drawn, in order to determine the size of the drawing, and then the user will grasp the pencil holder 25 and adjust the rocking member 11 and the view finding means so as to line up different points of the object to be drawn with the vision tube and the locating point In Fig. 4. the line of vision, which is also the longitudinal axis ofthe view finding means, is indicated at X. In manipulating the pencil to perform this operation, the stroke of the pencil will be governed by the vision of the user in tracing the outline.

visually, of the object to be drawn and therefore the object viewed by the user will be reproduced upon the drawing paper.

My improved clamp for the forked sup port includes a spreader clamping member 51 which extends abreast of the members 5 on one side thereof. Said spreader clamping member is provided with an inturned spreading portion 52 having diverging walls so that when the spreading member is forced between the legs 5 of the shank 5, it will spread the legs 5 apart from each other to the desired extent. Said spreading member 51 is also provided with lateral flanges 53 which engage the outside faces of said members 5'. My improved clamping device also includes a holdingplate 54 which is disposed on the opposite side of said legs or bars 5 and which is provided with flanges 55 which engage the lateral faces of the bars 5 to coact with the flanges 53 in holding said bars 5 against excessive displacement. The lower margin 56, of said holding plate 54, is bent upwardly, as shown in Figs. 2 and 7, to receive the lower end of a board abutment portion of the clamp which will now be described in detail.

The board abutment of the clamp, com prises, as shown, a single strip of metal or like material having a supporting length 57 which extends downwardly and which has its lower end 58 projected into the said lower edge 56 of the holding plate The stock of said abutment is bent upon itself at 59, and extends downwardly at 60 to a point 61. The stock is then bent at 62 and 63 to form an edge abutment for engagement with the edge of the drawing board 1 and the edge of the cleat or backing 4. The stock extends upwardly at 64 and 65 where it forms a top abutment for engagement with the top of the drawing board 1. Thereafter, the stock extends downwardly, as at 66, to complete the structure. A bolt 67 is shown extending diagonally through the batten or cleat 1, and the board 1, and through the abutment portion and the clamp portion where it is en gaged by a winged nut 68 for clamping the parts in position.

My improved clamping means includes mechanism for adjusting said forked support so as to dispose the rocking axis of the member 11 parallel with one transverse. dimension of the drawing board 1.

As illustrated, nuts 69 are interposed in the abutment of the clamp and set screws 70,

' two in number, extend through a portion of the abutment of the clamp and through said nuts 69 into engagement with the holding plate 54. In order to true up the support, prior to turning the winged nut 68 tightly home, either one of the set screws 70 can be turned to the desired extent to tilt the support laterally.

By reference to Fig. 2, it will be seen that the axis of the pencil 26, intersects the rocking axis of the member 11,. this arrangements being efiected by disposing bar 22 behind the bar 21 so that both the line of vision X and the marking axis will intersect the rocking axis, the marking axis being the longitudinal axis of the pencil 26.

My invention also includes the improved method which consists in viewing the subject matter to be drawn and simultaneously transferring said subject matter to the drawing surface while the eye of the operator is fixed on said subject matter. v

It is believed that the utilities and advantages of my invention will be fully understood from the foregoing description, and while I have herein shown and described one specific form of my invention, I do not wish to be limited thereto except for such limitations as the claims may import.

I claim 1. In a sketching or drawing apparatus, a support adapted to overhang a drawing surface, a rocking member mounted to oscillate on said support, a pencil holder movably mounted on said rocking member to swing about a fixed axis, view finding means movably mounted on said rocking member to move about a fixed axis intersecting the axis of movement of said pencil holder, and mechanism operatively connecting said view finding means for actuation by said pencil holder, substantially as described.

2. In a sketching or drawing apparatus, a support adapted to overhang a drawing surface, a rocking member mounted to oscillate on said support, a pencil holder movably mounted on said rocking member to swing about an axis intersecting the axis of movement of said rocking member, view finding means mounted on said rocking member to swing about an axis intersecting the axis of movement of said rocking member and also the axis of movement of said pencil holder, and means operatively connecting said view finding means with said pencil holder to cause movement of the view finding means in synchronism with said pencil holder, substantially as described.

3. In a sketching or drawing apparatus, a support adapted to overhang a drawing surface, a rocking member mounted to oscillate on said support, a pencil holder mountedto swing on said rocking member about an axis fixed with respect to said rocking member, view finding means mounted to swing about an axis fixed with respect to said rocking member and at right angles to and intersecting the axis of movement of said pencil holder, and mechanism operatively connecting said view finding means with said pencil holder to cause the former to move in synchronism with the latter, substantially as described.

4. In a sketching or drawing apparatus,.

a support adapted to overhang a drawing surface, a rocking member mounted to oscillate on said support, a penc1l holder mounted to oscillate on said rocking member, a

view finding means mounted to oscillate on said rocking member and having its longitudinal axis at right angles to the longitudinal axis of said pencil holder, and inelastic mechanism operatively connecting said view finding means with said pencil holder to cause movement of the former in positive synchronism with the latter in either direction, substantially as described.

5. In a sketching or drawing apparatus, a support adapted to overhang a drawing surface, a rocking member mounted to oscillate on said support, a pencil holder having a pencil and said holder being mounted on said rocking member to oscillate about an axis at right angles to and intersecting the oscillating axis of said rocking member, the marking axis of said pencil intersecting the oscillating axis of said rocking member at the point of intersection of the oscillating axis of said pencil holder with the oscillating axis of said rocking member, substantially as described. a

6. In a drawing or sketching apparatus, a support adjacent a drawing surface, a rocking member mounted to oscillate on said support, view finding means mounted on said member to swing on an axis fixed with respect to said member, and pencil holding means directly connected with said rocking member to shift said means about the oscillating axis of said member and also directly connected with said means to shift the latter about its own oscillating axis, substantially as described.

7. In, a sketching or drawing apparatus, a view finder, means supporting said finder adjacent a drawing surface, marking means for actuating said finder in. sketching on said surface the outlines of the object seen through said finder, and a locator for said finder comprising a substantially rectangular resilient frame hinged to said finder, and

locator Wires held taut by said frame in crossed relation, substantially as described.

8. In a locator for a device of the class described, a finder frame, marking means, connected therewith a substantially rectangular locator frame hinged to said finder frame, and locator lines or wires disposed in crossed relation and connected and held taut by said locator frame, substantially as described.

9. In a device of the character described,

, a drawing board, sketching apparatus, a

support for the sketching apparatus, and clamping means comprising abutments engaging the edge and top of the drawing board, and means extending through the abutments and drawing board and through said support for securing the latter to the drawing board, substantially as described. 10. In a device of the character described, a drawing board sketching apparatus, a support for said sketching apparatus, and clamping mechanism comprising abutment means engaging the board and holding means engaging the support, and truing mechanism eoacting with the abutment and holding means to true up the support, substantially as described.

11. In a device of the character described, a drawing board sketching mechanism, a support for said sketching mechanism including a shank composed of spaced legs, a spacing member on one side of said shank for holding said legs in spaced relation, a holding plate on the opposite side of said shank for preventing excessive displacement means coacting with said abutment structure of said legs, an abutment structure engaging and said holding plate for adjusting said the drawing board and supported in said support, substantially as described. 10

holding plate, means extending through the In testimony whereof I afilx my signadrawing board and said abutment structure ture.

and said holding and spacing plates for clamping said support on the structure, and CHRISTIAN THOMSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of .Patents, Washington, D. G. 

